Kotaby pump



UNITED STATES PATENT OFFICE.

M. R. CLAPP, OF SENECA FALLS, NEW YORK.

ROTARY PUMP.

Specification of Letters Patent No. 21,550, dated September 21, 1858.

T 0 all whom t may concern.'

Be it known that I, M. R. CLAPP, of Seneca Falls, in the county ofSeneca and State of New York, have invented a new and Improved Mode ofConstructing Pumps; and I do hereby declare that the following is a fulland exact description thereof, reference being had to the accompanyingdrawings, making part of this specification, and to the letters ofreference marked thereon.

Figure 1, is a vertical section, Fig. 2, is a transverse section on theline of Fig. l.

Similar letters refer to corresponding parts in both.

My invention consists of a cylindrical case A, provided with internalteeth or cogs b b. A cylinder C, of less diameter' than the caserevolves within the same on a shaft, D, having bearings on each side. Acircular portion is taken out of one side of C, to receive the pinion E,which revolves on the journals f in bearings in the side plates g, g, ofsaid cylinder. The teeth of the pinion correspond with and mesh into theinternal gearing b, and the cylinder, C, being rotated in the directionindicated by the arrow the pinion traverses the periphery of the caserevolving in a counter direction to that of the cylinder.

A deep circular recess, 7L, is formed in one side of the pinion to allowit to pass the butment K. This butment divides the suction pipe L, anddischarge M, and also the induction and eduction ports, 0, 29, in theside of the case. It reaches to the cylinder C, and packs against itsperiphery which is turned true to form a tight joint, and prevent thepassage of the water.

Recesses are formed in the sides of the case r 1", and the sides of thecylinder pack the case at the angles s s thereby obviating the frictionof a large amount of surface. The sides of the pinion, E, iit againstthe sides of the case, and the sides of its teeth are accurately fit-tedto match with those of the case so that no water passes them; thepacking being insured by the back pressure of the water in advance ofthe pinion, as well as the suction draft, which tend to keep the partsin contact. The ends of the teeth should also fit quite closely to therecess in cylinder C, in order that the water shall not pass them,though close packing Rotary is not so essential at this point since thedirection in which the teeth move is opposed to the direction which thewater must pursue, and therefore it is constantly bringing back'whatwould otherwise escape.

The operation is as follows ;-power being applied to rotate the cylinderc, the pinion E becomes a revolving piston, forcing the water in advanceof its course, and creating a vacuum behind as is usual in this class ofpumps. The water in advance of the piston cannot pass the butment, andistherefore driven through opening p and out of the discharge pipe M. Thepiston does not pack wit-h the periphery of the case, in the usualmanner by the close contact of their surfaces, but by the cogs of onelapping by those of the other, whereby the force of the body'of watermoved is employed to press one plane surface upon another, insurinrtheir contact at all times. The eiifect of wear does not render theirpacking imperfect,l but on the contrary improves the joints, as theteeth become ground or worn to each other, forming a better fit, and thefriction being on the sides of the teeth entirely, the principleinvolved does not become inoperative in the least. Its construction isvery simple and cheap, and from the limited amount of friction of itsparts it works with little power, and will prove durable. It is designedto work as a steam engine as well as pump, for which oiiice it isparticularly well adapted, and possesses the same advantages in the modeof packing as when used as a pump. Its capacity may be increased asdesired by increasing the depth of the case.

I am aware that corrugated or cogged pistons have been used and suchalone I do not claim, but

That I claim as my invention, and desire to secure by Letters Patent,is,

The combination and arrangement of the revolving toothed pinion E andcylinder C, with the butment K, or its equivalent, cylindrical case A,and internal gearing b, substantially as and for the purposes herein setforth.

M. R. CLAPP.

Witnesses A. FAILiNG, W. S. DASEE.

